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Determining heat intensity of a fatigue crack from measured surface temperature for vibrothermography
Measurement Science and Technology ( IF 2.4 ) Pub Date : 2020-06-24 , DOI: 10.1088/1361-6501/ab8cfd
J S Vaddi , T J Lesthaeghe , S D Holland

We propose a simulation-assisted linear-inversion method to estimate heat intensity generated at a fatigue crack during vibrothermographic nondestructive evaluation. In vibrothermography, mechanical excitation is applied to a test specimen, and the contacting crack faces generate heat which flows to the surface and can be detected by an infrared camera. The heat intensity generated at the crack is not a directly measurable quantity, and instead has to be estimated by inverting the measured crack surface temperature. This inversion is an ill-posed problem because of the inherently diffusive nature of heat flow. The proposed method in this paper attempts to estimate the crack heat intensity by minimizing the squared error between numerically modeled crack heating and the experimentally measured surface temperature of the crack. We demonstrate that with reasonable assumptions, the effect of diffusion on the heat intensity can be overcome, and it is possible to estimate the crack he...

中文翻译:

根据测温的表面温度确定疲劳裂纹的热强度

我们提出了一种模拟辅助的线性反演方法,以估计在振动热成像无损评估过程中在疲劳裂纹处产生的热强度。在振动热成像中,对样品施加机械激励,接触的裂纹面产生热量,该热量流到表面并可以通过红外热像仪检测。裂纹处产生的热强度不是直接可测量的量,而是必须通过反转测得的裂纹表面温度来估算。由于热流的固有扩散特性,这种倒置是一个不适当地的问题。本文提出的方法试图通过最小化数值模拟的裂纹加热与实验测量的裂纹表面温度之间的平方误差来估计裂纹的热强度。
更新日期:2020-06-25
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